AD07.61-P-4000-55BA | One intake valve of a cylinder is not actuated with cylinder shutoff OFF, ME-SFI fault code description | Engine 113.960 from 6/00 with Code (479) Cylinder shutoff | |
One intake valve of a cylinder is not actuated at cylinder shutoff OFF. | ||
1 | Fault code ( Display on generic scan tool) | P20A2 (-) |
2 | Fault storage Activation of the engine diagnosis indicator lamp (EURO3/4) or CHECK ENGINE (MIL) malfunction indicator lamp | After expiry of test duration and fault No activation |
3 | Checking frequency | Continuous |
4 | Checked signal or status | Combustion misfires (detection by smooth running evaluation) |
5 | Fault setting conditions | If, due to a faulty rocker arm coupling (rocker arm, coupling pins) only one intake valve of a cylinder is operated, misfires will occur in the upper load and speed range. |
6 | Check prerequisites | - Engine speed greater than 5000 rpm - Load higher than 80 % - No fault in hot film mass air flow sensor, crankshaft position sensor, pressure sensor (intake manifold) - No fault at cylinder shutoff valves (Y80, Y81). |
7 | | - The output fault code is used as additional service info only, as with this test, it is not possible to clearly assign the cause to cylinder shutoff. If a fault occurs, the engine diagnosis malfunction indicator lamp is actuated immediately due to the simultaneous active fault detection of a "TWC-damaging" misfire. |